Re: [ATM] pressing and glueing a wooden disk

["Malcolm McDonald" <toliman@wave.co.nz>]

----- Original Message ----- 
From: "Dominic-Luc Webb" <dlwebb@canit.se>
To: "ATM Superheros" <atm@atmlist.net>
Sent: Monday, August 13, 2007 8:21 PM
Subject: [ATM] pressing and glueing a wooden disk


> While we are talking wood and glue...
>
> In trying out Mel's strategy of using a wooden polishing tool (in
> this case, it is also oversized), I began work this weekend on a
> tool. Thick plywood (~19 mm or 3/4 inch) could not be found locally,
> so I came up with something similar using 21 x 145 mm wooden
> boards (conifer softwood of of some kind). My mirrors are 310-315 mm
> diameter, so I laid 3 boards side-by side and cut circles. I made
> 3 sets of 3 circles, which used up a bit less than one standard
> 3600 mm length of this type of wood. Each successive layer is
> rotated 60 degrees, pics here:
>

I have found 29mm Particle Board very easy and very good for making pitch 
laps. It is lite, strong and very stable. Having no grain, it does not warp 
and is the same strength in any direction. If it is going to  get wet, and 
it probably will, paint it well. If it absorbs moisture it will swell.

I used double thickness for my 20".  To glue it I simply daubed one surface 
all over with PVA glue,lined them up in the vice and clamped it round the 
edges. No need for nails.

To remove the pitch, put it in the freezer (if it will fit) then put it in a 
plastic bag and wack it hard with a hammer. the board won't break.

                 Malcolm





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